Biology/drawing blood
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Question
When drawing blood, why is the needle always placed in veins? And why in the direction blood is flowing back to the heart?
There are a couple of reasons that venous blood is drawn Wendy. One is that the diagnostic tests that are needed can be done with venous blood and secondly the puncture of ateries is much more invasive due to the higher pressure on the artery.
Veins carry blood to the heart and not away from it.
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Answers by Expert:
Walter Hintz
Expertise
Science teacher for over 50 years. MSc. in biology. I can answer questions in general biology, zoology, botany, anatomy and physiology and biochemistry.
Experience
I have a MSc in biology and have been a science teacher for over 50 years. At present I am a faculty member at a college and a science consultant at seven catholic schools.
Publications
The Ohio journal of Science
Momentum-The Journal of the Catholic Education Association
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